Evaluation of the results of automatic earthquake location systems of Anhui network

At present, the automatic earthquake positioning systems operated by Anhui network include the automatic earthquake report system (AU) of China Earthquake Administration, the automatic positioning system of Jiangsu, the automatic positioning system of Fujian and the Anhui regional earthquake early warning system. Taking the earthquake cases in Anhui and its surrounding provinces from 2015 to 2019 as the research object, the results of the above four sets of system have been compared with the unified official catalogue of China Earthquake Administration respectively. The results show that the outputs of these automatic systems are all within the error range allowed by the seismic fast reporting requirements, and they all have applicability and practicability in Anhui region, while there are some defects in identifying double earthquakes and false triggering by remote earthquakes. At the same time, the comparison and analysis among these systems show that the average time of the first reported positioning results produced by Anhui regional earl warning system is 15.26 seconds, and the average of the final reported positioning results is 46.56 seconds. This system has obvious advantages in the speed of automatic quick reporting, the average seismic time difference, the average epicenter position difference, and average magnitude difference of the output parameters.